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Originally Posted by julli
Thank you all for advice and interest in this story. I took the watch to my watchmaker today where it was disassembled. Then I took the case components to a jeweller for case material testing. The watch is original 18k yellow gold but has been plated white gold inside the case and case back (for what reason I can only guess until I have contact with the previous owner). The dial is made by Rolex but relatively recently as it has Luminova, so 2000 or later. So where I stand now: This is an 1976 Rolex 1803 Yellow gold 18k President Day-Date that had a major service this century where the dial was changed and the case plated on the inside. Will try to post pictures later.
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Are you certain it wasn't originally white gold and replated yellow in the outside?? That would make much more sense and from your pictures there appear to be whiteish areas as if a yellow gold plating has worn off (may just be reflections)
An interesting one for sure 
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Past: 6239 (yes, I know...  ), 16610, 16600, 116515, 116613LN, 126600, 126711 CHNR
Present: 16600, 116509, Cartier Santos Green.
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